Re: AZ31 as rectifier for a stereo Mullard 3-3?
Another vote for the EZ81 if you have sufficient heater current available. There's no need for a separate rectifier heater winding as the EZxx rectifiers are designed to withstand HT between heater and cathode. I have never ever seen a failure in this respect.
AZ31s are a little bit special now, and should perhaps be kept for the bowden cable afficionados who restore the rather splendid Philips sets of old. A directly heated rectifier would not do the capacitors in your amplifier any favours in any event.
Leon.
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